Pipe alignment mechanism of butterfly valve

Abstract

Provided is a butterfly valve pipe alignment mechanism configured so that favorable usability can be provided and an alignment process in plumbing can be easily performed. In the present invention, a groove ( 10 ) into which a positioning tool ( 11 ) is to be inserted is provided at a portion below a top flange ( 6 ). An end surface position of the groove ( 10 ) is on a plane on which a pipe flange ( 7 ) and a valve box ( 1 ) are joined to each other. The groove ( 10 ) is drilled in an elongated oval shape, and groove step portions ( 10 a, 10 b, 10 c ) projecting in both directions of a lateral direction are formed at multiple positions of the groove ( 10 ) so that the groove ( 10 ) can accept various flange connection standards.

The invention claimed is: 
     
       1. A pipe alignment mechanism of a butterfly valve detachably attached to a columnar valve stem bearing portion provided to protrude from an outer peripheral portion of a cylindrical valve main body and extending in a radial direction, comprising
 a groove provided at a top flange lower portion of a valve box such that a positioning tool is fittable in the groove, wherein 
 a groove end surface position is on a plane on which a pipe flange and the valve box are joined to each other, 
 the groove has at least one insertion groove in which a fitting protrusion provided at the positioning tool is fittable, and 
 the at least one insertion groove is provided at different positions such that various flange connection standards are acceptable. 
 
     
     
       2. The pipe alignment mechanism of the butterfly valve according to  claim 1 , wherein the positioning tool includes a portion to be inserted and fitted in the groove and a portion configured to contact a pipe flange outer peripheral surface. 
     
     
       3. The pipe alignment mechanism according to  claim 2 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       4. The pipe alignment mechanism according to  claim 1 , wherein a positioning tool housing portion is provided at a top flange. 
     
     
       5. The pipe alignment mechanism according to  claim 4 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       6. The pipe alignment mechanism according to  claim 1 , wherein the positioning tool includes a freely-expandable/contractable bayonet mechanism with a claw. 
     
     
       7. The pipe alignment mechanism according to  claim 6 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       8. A pipe alignment mechanism of a butterfly valve detachably attached to a columnar valve stem bearing portion provided to protrude from an outer peripheral portion of a cylindrical valve main body and extending in a radial direction, comprising
 a groove provided at a top flange lower portion of a valve box such that a positioning tool is fittable in the groove, wherein 
 a groove end surface position is on a plane on which a pipe flange and the valve box are joined to each other, 
 the groove has at least one hole in which a rod-shaped protrusion provided at the positioning tool is insertable, and 
 the at least one hole is provided at different positions such that various flange connection standards are acceptable. 
 
     
     
       9. The pipe alignment mechanism of the butterfly valve according to  claim 8 , wherein the positioning tool includes a portion to be inserted and fitted in the groove and a portion configured to contact a pipe flange outer peripheral surface. 
     
     
       10. The pipe alignment mechanism according to  claim 9 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       11. The pipe alignment mechanism according to  claim 8 , wherein a positioning tool housing portion is provided at a top flange. 
     
     
       12. The pipe alignment mechanism according to  claim 11 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       13. The pipe alignment mechanism according to  claim 8 , wherein the positioning tool includes a freely-expandable/contractable bayonet mechanism with a claw. 
     
     
       14. The pipe alignment mechanism according to  claim 13 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       15. A pipe alignment mechanism of a butterfly valve detachably attached to a columnar valve stem bearing portion provided to protrude from an outer peripheral portion of a cylindrical valve main body and extending in a radial direction, comprising
 a groove provided at a top flange lower portion of a valve box such that a positioning tool is fittable in the groove, wherein 
 a groove end surface position is on a plane on which a pipe flange and the valve box are joined to each other, 
 the groove has at least one insertion groove in which a fitting protrusion provided at the positioning tool is fittable, and has at least one hole in which a rod-shaped protrusion provided at the positioning tool is insertable, and 
 the at least one hole and the at least one insertion groove are provided at different positions such that various flange connection standards are acceptable. 
 
     
     
       16. The pipe alignment mechanism of the butterfly valve according to  claim 15 , wherein the positioning tool includes a portion to be inserted and fitted in the groove and a portion configured to contact a pipe flange outer peripheral surface. 
     
     
       17. The pipe alignment mechanism according to  claim 16 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       18. The pipe alignment mechanism according to  claim 15 , wherein a positioning tool housing portion is provided at a top flange. 
     
     
       19. The pipe alignment mechanism according to  claim 18 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion. 
     
     
       20. The pipe alignment mechanism according to  claim 15 , wherein the positioning tool includes a freely-expandable/contractable bayonet mechanism with a claw. 
     
     
       21. The pipe alignment mechanism according to  claim 20 , wherein the positioning tool has multiple protrusions on a surface configured to contact the groove and a surface configured to contact the tool housing portion.